fix: add COMPOSE_PROFILES param to middleware.env.example file

[ACAne0320]

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Summary

fixed #28540

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @ACAne0320, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the setup process for Dify's middleware services by integrating Docker Compose profile configuration directly into the middleware.env.example file. This change simplifies the docker compose up command, making it more user-friendly and less prone to errors by automatically loading the necessary profiles based on the environment variables defined.

Highlights

• Simplified Docker Compose Profile Management: The COMPOSE_PROFILES variable has been added to middleware.env.example, allowing Docker Compose profiles to be configured directly within the environment file.
• Updated Documentation for Middleware Startup: The docker/README.md file has been updated to reflect the new, streamlined method of starting middleware services, which now leverages the middleware.env file to automatically load profiles, eliminating the need for explicit --profile flags in the command.

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[Copilot]

Pull request overview

This PR adds the COMPOSE_PROFILES environment variable to the middleware.env.example file to enable automatic profile selection when running Docker Compose middleware services. This aligns the middleware development setup with the main .env.example configuration, which already includes this variable. The change allows developers to run middleware services without manually specifying --profile flags.

Key changes:

• Added COMPOSE_PROFILES variable to middleware.env.example with dynamic value based on DB_TYPE
• Updated README.md documentation to reflect the simplified Docker Compose command and explain automatic profile loading

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docker/middleware.env.example	Added COMPOSE_PROFILES variable configuration section to enable automatic profile selection for database and vector store services
docker/README.md	Updated middleware deployment instructions to remove manual --profile flag and document automatic COMPOSE_PROFILES loading

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[gemini-code-assist]

Code Review

This pull request improves the Docker deployment experience by simplifying the command to start middleware services. It introduces a COMPOSE_PROFILES variable in the middleware.env.example file, which allows Docker Compose to automatically select the correct profiles for the database and vector store. This removes the need for users to manually specify profiles on the command line. The changes are logical and well-implemented. I've only suggested a minor clarification in the README to ensure the documentation accurately reflects the new configuration.

[gemini-code-assist]

To improve clarity and prevent potential confusion for users, it would be best to make the explanation of the COMPOSE_PROFILES variable in this note consistent with its definition in the middleware.env.example file. The current note omits the default value for DB_TYPE.

Suggested change

	> Compose automatically loads `COMPOSE_PROFILES=${DB_TYPE},weaviate` from `middleware.env`, so no extra `--profile` flags are needed. Adjust those variables if you want a different combo.
	> Compose automatically loads `COMPOSE_PROFILES=${DB_TYPE:-postgresql},weaviate` from `middleware.env`, so no extra `--profile` flags are needed. Adjust variables in `middleware.env` if you want a different combination of services.